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Old 01-23-2007, 01:40 PM   #1
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I had a very troubling situtation this past weekend. Driving at interstate speeds, light to medium rain and around 40 degree temperatures. Obviously high humidity levels.

No matter what I did, I could not keep the inside of the windshield free of condensation. I tried cold, warm and hot air with the fan on low, medium and high speeds. I also tried to add the windshield fan but to no avail.

I verified air was coming out of the vents at the bottom of the windshield but still could not keep up.

Anyone else have this problem and how can I keep from happening again? Will a Rain-X type product help?
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Old 01-23-2007, 01:40 PM   #2
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I had a very troubling situtation this past weekend. Driving at interstate speeds, light to medium rain and around 40 degree temperatures. Obviously high humidity levels.

No matter what I did, I could not keep the inside of the windshield free of condensation. I tried cold, warm and hot air with the fan on low, medium and high speeds. I also tried to add the windshield fan but to no avail.

I verified air was coming out of the vents at the bottom of the windshield but still could not keep up.

Anyone else have this problem and how can I keep from happening again? Will a Rain-X type product help?
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Old 01-23-2007, 03:12 PM   #3
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my guess is you had a lot of mosture in the coach..did you have a roof vent open to get the mosture out or turn deforster up to max temp to heat windshield enough so it would not condense the mosture..
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Old 01-23-2007, 03:44 PM   #4
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My coach has over head blower vents that you can turn towards the windshield that can help with fog up windows. People sometimes forget them. Should have switchs for over head fans low,med and high, fan motor is located in cabinet over driver behind removeable panel.
Rain-x may help but never needed it.
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Old 01-23-2007, 07:20 PM   #5
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I did indeed turn the defrost to max heat and high fan. It seemed to keep the bottom 1/4 of the windshield clear but not where I could see out comfortably. The roof vents were closed and the heat was also on in the coach to keep a comfotable temperature in back.

My DSDP has the blower at the windshield as well although I have not discovered how to aim the vents. The fan appears to be in the cabinet above the driver. I had this fan on high as well as the defrost on high. It would just never clear the windshield.

I may try some anti-fog products to see if this will help the next time.
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Old 01-24-2007, 04:25 AM   #6
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I've had that before. It's a tough combination to beat when you have that much glass area, the outside temps are falling, and there's lots of moisture in the coach.

We had that pretty bad when descending the Bighorns last fall. The rain turned to slush and then snow as we got to the top, then tiptoed on down through the mountains. The windshield was just too cold and the interior was too moist for the defrosters and fans to do any good. We had to stop often anyway to beat the ice off the wipers and clean the slush wads off the sides of the windshield so that we could see the mirrors so we wiped the thing down and went on for a while. For winter driving it would be nice to have better defrosting because all of these class As are marginal in that area. An auxiliary heat source with blowers mounted up high behind the front TV would be nice but I don't know of one that's available. Hmmmmm, sounds like I may have a project coming up.
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Old 01-24-2007, 04:50 AM   #7
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The only thought I have is that the dash a/c compressor MUST be running or defogging performance will be marginal at best.

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Old 01-24-2007, 05:09 AM   #8
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Maybe we can find some 12v heat element that we can mount in blower to heat up windshield from above.
I haven't been driving in winter weather lately just parked.
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Old 01-24-2007, 12:39 PM   #9
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all good answers..one more thought did you smell any sweet odors?..if yes possible heating core leak which would add mosture to the coach..highly unlikely but possible..re using a/c..not sure what that would do as you are trying to heat window...would help in warm weather
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Old 01-24-2007, 01:00 PM   #10
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Warm air holds more moisture than cold air...hence the water vapor from your warm, moist coach was being condensed into a fog on your windshield.
You do need to have the air conditioning compressor working to dry the air being blown on the windshield by the defroster. If not, you are simply blowing warm moist air against a cool windshield.
When I have encountered this situation, I turn off the coach heater and use only the defrost setting along with the extra air flow with the overhead fans. I also open the driver side window about a half inch to promote better air flow and the exit of warm moist air coming off the windshield area.
the anti fog cloth can reduce the effect of the condensation, but do not cure it. You simply had too much moisture in your coach...probably even more that what was in the outside air.
Think in terms of more air flow and cooler temps to reduce the problem.
If all else fails, take a break, run the furnace, open a top vent and wait a while.
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